Reamer



R. W. ANDR EASSON REAMER Filed 001;. 4, 1937 Aug. 16, 1938.

' INVENTOR [fly/65712194550 A TTORNEY Patented Aug. 16, 1938 i Y UNITED STATES :PATE'NT OFFICE REAMER, Rudolf W. Andreasson, Detroit, Mich. Application October 4, 1937, Serial No. 167,112 4 Claims. (01. 77-755) "This invention relates to reamers and in paron a radius from the center of the said main body ticular to adjustable blade type reamers and portion l2, see Figs. 2, 6 and '7. means for positively locking theblades thereof Each cutting blade l3 has the inwardly disin theiradjusted position. posed bearing edge 20 thereof vertically tapered The main object of this invention is to provide with respect to the outwardly disposed cutting an adjustable blade type reamer having a simple, edge 2| thereof on an angle complementary to sturdy, quick acting locking means for positively the base [9 of the said vertically disposed tapered securing the blades thereof in their adjusted slots 58 in the main body portion [2.

position. The upper part of the main body portion l2 of Another object of the invention is to provide an the reamer is threaded at 22 to accommodate a 10 adjustable blade type reamer in which the blades blade retaining collar 23 having a re-entrantly thereof may be secured in their adjusted position beveled lower face 24 against which the compleby a single locking operation. mentarily upper beveled ends 25 of the cutting "Another object of the invention is toprovide an blades I3 are compressed when locked in the adjustable blade reamer including serrated blades reamer as hereinafter described. The adjusted v15 therefor and means for locking the said serrated location at which the collar 23 is positioned on blades into a vise-like biting engagement with the main body portion 12 of the reamer deterthe reamer body. mines the adjusted diameter of the cutting edges Other objects of the invention will become ap- 2! of the said cutting blades l3'thereof which are parent by reference to the following detailed dedisposed in the tapered slots 18 because of the 20 scription taken in connection with the accomfactthat the bearing edges 20 of the said cutpanying drawing, in which: ting blades I3 and the bases IQ of the said tapered Fig. 1 is a vertical elevational View of an adslots l8 are complementarily beveled. A lock nut justable blade type rearner embodying the in- 26 on the upper threaded part 22 of the main 25 vention. body portion l2 secures the blade retaining collar 25 Fig. 2 is a bottom view of the embodiment of 23 in its adjusted position thereon when turned the invention disclosed in Fig. 1. tightly thereagainst. Wrench apertures N are Fig. 3 is a vertical sectional view taken on the p e y p v d in the blade retaining 001131 line 3 -3 of Fig, 1. 23 andthe lock nut 26. Fig. 4 is a vertical sectional view similar to Fig. Thebottom the main dy po t W of 30 3 except exploded to better show the invention. reamel' s bevele as at 28 for engagement by Fig. 5 is a cross sectional view of the blade lockcomplementarily y v d pp lug nut taken on the line 55 of Fig. '7. face 29 of the blade locking nut M which is pro- Fig. 6 is a cross sectional view taken on the line Vided With e Ver ca y disposed slot 30 for each 5 5 1, vertically disposed slot S8 in the main body por- 5 Y Fig. 7 is a cross sectionalview taken on the line tion 52 e e e equally Spaced around the 1 1 of Fi 1, periphery of the said nut I l whereby to permit Referring now to the drawing wherein k the said'nut M to be positioned over the lower merals refer to like and corresponding parts depending ends of the cutting blades l3 after the 40 throughout t everal views, h novel reamer said cutting blades l3 have been positioned in the 40 disclosed therein comprises, in general, a shaft vertically disposed Slots l8 in t ma n body p rlfl having the upper tapered end thereof suitf Teamer and urged agamst the ably formed at H for engagement by means for blade retaining collar 23 thereof as best shown rotating the same and a lower main body pop in Fig. 3. The. sald blade locking nut I4 is cention '2 formed to accommodate a plurality f trally bored and counterbored at 3i to provide a 5 shoulder 32 for engagement by the head 33 of the g f l fgg g figi af f gfz set screw l5 when turned into the threaded bore '4 and a Single set screw '5. lfilll the said main body port on I2 of the said The main body portion I2 of the reamer is Gem reamer. A suitable socket 34 is provided n the Many bored and counterbored at '6 and H head 33 of the said set screw it to permit the 5 said set screw IE to be engaged and turned b spectively from the bottom thereof and is prosuitable tightening means y vided with a plurality of vertically disposed taw locking nut 14 engages the lower pered s s I8 preferably equally spaced around beveled end 28 of the main body portion I2 of the 35 the periphery of the said main body portion l reamer after the cutting blades I3 have been one slot l8 being provided for each cutting blade suitably inserted therein against the upper blade l3 used. The base l9 of each of the tapered slots retaining collar 23 and against thelbase [9 of the 18 1S deeper toward the upper portion of the said verticallydisposed:slots IB thereof, the set screw slots l8 than at the bottom thereof. Each slot I5 is tightened whereupon the said locking nut IB is preferably disposed with one edge thereof 14 causes the lower slotted end of the main body 60 portion I2 of the reamer to grip the cutting blades I3 thereof thereby securing the said blades tightly therein, quickly and positively with a single locking operation.

If and when reamers are subjected to heavy duty it may be desirable to lock the cutting blades I3 thereof positively into substantially integral engagement with the main body portion of the reamer. In which event, the cutting blades I3 are suitably deformed, as, for example, by forming serrations I30 in the trailing side thereof with respect to the rotation of the reamer into which they are to be locked, prior to the hardening of the said cutting blades I3. By the use of such serrated and hardened cutting blades I3 in combination with the novel reamer and blade blocking means disclosed herein, the said cutting blades I3 out into the surface of the slotted main body portion I2 near the bottom thereof as indicated by the numeral in Figs. 3 and 4 whereupon a vise like biting engagement between the slotted main body portion I 2 and the serrated sides l3!) of the cutting blades I3 is accomplished as indicated in the right hand half of Fig. 6.

Although but one embodiment of the invention has been disclosed and described herein, it is to be understood that various changes including the size, shape, arrangement and detail of the parts thereof may be made without departing from the spirit of the invention and it is not intended to limit the scope thereof other than by the terms of the appended claims.

I claim:

1. A reamer comprising, in combination, an upper shaft and a lower main body portion having its lower end beveled, the said main body portion being axially bored and counterbored at the bottom thereof and provided with a plurality of vertically disposed circumferentially spaced slots to accommodate a pluralityof cutting blades, a cutting blade disposed in each of the said slots in the main body portion, means threaded on the upper end of the said main body portion adapted to retain the top of the said cutting blades in said slots in the main body portion when urged thereagainst, a blade locking nut adapted to telescopingly receive the lower ends of the said cutting blades and draw the lower beveled end of the said main body portion radially inward when urged thereagainst, and means threaded in said axial bore for urging the said locking nut axially upward whereby to cause the said lower slotted end of the said main body portion to grip the said cutting blades thereby securing the said cutting blades tightly in the said reamer.

2. A reamer comprising, in combination, an upper shaft and a lower main body portion having its lower end beveled, the said main body portion being axially bored and counterbored from the bottom thereof and provided with a plurality of circumferentially spaced axially extending radially tapered slots deeper near the top thereof than at the bottom thereof, a complementarily tapered cutting blade disposed in each slot having its upper outer corner beveled, a blade retaining collar threaded on the upper end of the said main body portion having a re-entrantly beveled lower face against which the upper beveled ends of the said cutting blades compress when locked in the reamer, a blade locking nut having a like circumferentially spaced axially extending slot therein for each slot in the main body portion ,of the reamer and a re-entrantly beveled upper annular face adapted to telescopingly receive the lower ends of said cutting blades and engage the beveled bottom of the said main body portion of the reamer in such a manner as to draw the lower end of the said reamer body radially inward when urged thereagainst, and a set screw threaded in the said axial bore of the said main body portion of the reamer adapted to urge the said blade locking nut against the beveled bottom thereof whereby to cause the lower slotted end of the main body portion of the said reamer to grip the said cutting blades and secure the said cutting blades tightly in the said reamer.

3. A reamer comprising, in combination, an upper shaft and a lower main body portion having its lower end beveled, the said main body portion being axially bored and counterbored from the bottom thereof and provided with a plurality of circumferentially spaced axially extending radially tapered slots deeper near the top thereof than at the bottom thereof, a complementarily tapered cutting blade having at least one side thereof serrated disposed in each slot having its upper outer corner beveled, a blade retaining collar threaded on the upper end of the said main body portion having a reentrantly beveled lower face against which the upper beveled ends of the said cutting blades compress when locked in the reamer, a blade locking nut having a like circumferentially spaced axially extending slot therein for each slot in the main body portion of the reamer and a re-entrantly beveled upper annular face adapted to fit over the lower ends of said cutting blades and engage the beveled bottom of the said main body portion of the reamer in such a manner as to draw the lower end of the said reamer body radially inward when urged thereagainst, and a set screw threaded in the said axial bore of the said main body portion of the reamer adapted to urge the said blade looking nut against the beveled bottom thereof whereby to cause the lower slotted end of the main body portion of the said reamer to grip the said cutting blades at the serrations therein and secure the said cutting blades tightly in the said reamer with a vise like biting engagement therewith.

4. A reamer comprising, in combination, an upper shaft and a lower main body portion having its lower end beveled, the said main body portion being axially bored and counterbored from the bottom thereof and provided with a plurality of circumferentially spaced axially extending radially tapered slots deeper near the top thereof than at the bottom thereof, a complementarily tapered cutting blade disposed in each slot having its upper outer corner beveled, a blade retaining collar threaded on the upper end of the said main body portion having a re-entrantly beveled lower face against which the upper beveled ends of the said cutting blades compress when locked in the reamer, a blade locking nut having a like circumferentially spaced axially extending slot therein for each slot in the main body portion of the reamer and a re-entrantly beveled upper annular face adapted to telescopingly receive the lower ends of said cutting blades and engage the beveled bottom of the main body portion of the said reamer in such a manner as to draw the lower end of the said reamer body radially inward when urged thereagainst, and means for urging the said locking nut upwardly against the beveled bottom of the said reamer.

RUDOLF W. ANDREASSON. 

